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<head>
  <title>Various tests for semantics</title>
  <meta charset="utf-8"/>
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<body>
  <p>Empty semantics (invalid): <math><maction></maction></math></p>
  <p>annotation (invalid): <math><mrow><mtext>annotation</mtext></mrow></math></p>
  <p>annotation-xml (invalid): <math><mrow><mrow><mtext>annotation-xml</mtext></mrow></mrow></math></p>
  <p>presentation MathML (no annotations): <math><mrow><mtext>presentation MathML</mtext></mrow></math></p>
  <p>content MathML (no annotations): <math><maction actiontype="toggle"><csymbol>content MathML</csymbol></maction></math></p>
  <p>presentation MathML ; annotation: <math><mrow><mtext>presentation MathML</mtext></mrow></math></p>
  <p>presentation MathML ; annotation-xml: <math><mrow><mtext>presentation MathML</mtext></mrow></math></p>
  <p>content MathML ; annotation: <math><mrow><mtext>annotation</mtext></mrow></math></p>
  <p>content MathML ; annotation-xml: <math><mrow><mrow><mtext>annotation-xml</mtext></mrow></mrow></math></p>
</body>
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